SOQ_18 - SOQ 18 1 Viruses are strands of nucleic acid...

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SOQ 18 – 1. Viruses are strands of nucleic acid encased within a protein coat. They can contain either RNA or DNA. Plant viruses have a cylindrical coat around the virus, the shape of which is determined by the RNA around it. Animal viruses have a two strand RNA core is held within a capsid (protein sheath) that is encased by an envelope. The macromolecules that comprise viruses are nucleic acids and protein. Host Range: the suitable cells required for a specific virus to replicate. 2. 3. The parts of a typical virus are the RNA of DNA encoding sequence and the protein coat that they are encased in. Shape: Isometric: icosahedron: 20 equilateral triangle facets (like a geodesic dome) Helical: rod like or threadlike appearance. Roughly spherical. 4. Bacteriophages: Viruses that attack Bacteria: Complex structues (spider like) Examples: T series (T1, T2… etc.) They look lie the spider shaped viruses, with a head of DNA contained in a capsid and a neck with whiskers, which contact the bacterial cell walls. The tail of the viruses is connected to the base plate and tail fibers. 5. Two reproductive cycles: The Lytic Cycle: The whiskers of the virus contact the outer wall of the bacteria. The tail fibers set the virus perpendicular to the surface of the cell and insert the base plate into the host cell. The tail pierces the cell wall, and the contents of the virus’ head is injected into the host
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This note was uploaded on 04/17/2008 for the course HUMANITIES 111 taught by Professor Blume during the Winter '08 term at Union.

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SOQ_18 - SOQ 18 1 Viruses are strands of nucleic acid...

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